diff --git a/.npmignore b/.npmignore
deleted file mode 100644
index 75f6e22..0000000
--- a/.npmignore
+++ /dev/null
@@ -1,9 +0,0 @@
-amd-test/
-browser-test/
-browserify-test/
-header-test/
-webpack-test/
-.npmignore
-.travis.yml
-build.js
-test.js
diff --git a/package.json b/package.json
index 96dedd5..bec6916 100644
--- a/package.json
+++ b/package.json
@@ -6,9 +6,12 @@
   "scripts": {
     "build": "node build.js",
     "serve-tests": "http-server -p 1336",
-    "prepublish": "npm run build",
     "test": "mocha"
   },
+  "files": [
+    "source-map-support.js",
+    "register.js"
+  ],
   "dependencies": {
     "buffer-from": "^1.0.0",
     "source-map": "^0.6.0"